Abstract
This paper presents influence of rare earth metals (REM) on the properties
of GP240GH cast carbon steel. The research has been
performed on successive industrial melts. Each time ca 2000 kg of liquid metal
was modified. The rare earth metals were put into the ladle
during tapping of heat melt from the furnace. Because of this the amount of
sulphur in the cast steel was decreased and the non-metallic
inclusion morphology was significantly changed. It was found that non metallic
inclusions the cracking mechanism of Charpy specimens
and the impact strength were all changed. The following properties were
tested: mechanical properties (σy, σUTS), plastic properties
(necking, elongation) and impact strength (SCI). In the three-point bend test
the KJC stress intensity factor was evaluated.
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